Installation of the Clock

TASK 31-21-21-400-001-A
Installation of the Clock

ZONE: 210
FIN: 2FS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

C. Referenced Information

REFERENCE	DESIGNATION
TASK 31-21-00-710-002-A	Operational Test of the Clock
TASK 31-21-00-750-002-A	Procedure to Set the Clock
Clock

3. Job Set-up
Subtask 31-21-21-865-051-A

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	CLOCK/NORM/SPLY	6FS	F11
121VU	CLOCK/STBY/SPLY	4FS	N02

Subtask 31-21-21-865-054-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/MMR/1	42RT1	G12
** ON A/C NOT FOR ALL
121VU	COM NAV/MMR/2	42RT2	K09
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
** ON A/C NOT FOR ALL
121VU	COM NAV/MMR/2	42RT2	L07
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J41
121VU	CFDS/CFDIU/BACK/UP	8TW	J40

4. Procedure
Subtask 31-21-21-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Clock
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the electrical connectors (3) and (5).
(4) Make sure that the electrical connectors (3) and (5) are clean and in the correct condition.
(5) Connect the electrical connector (5) to the clock (2).
(6) Install the clock (2) in its housing (1).
(7) Tighten the screws (4).
(8) Install the thermoformed cover on the center instrument panel.

Subtask 31-21-21-420-050-B ** ON A/C NOT FOR ALL

Subtask 31-21-21-865-052-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	CLOCK/NORM/SPLY	6FS	F11
121VU	CLOCK/STBY/SPLY	4FS	N02

Subtask 31-21-21-750-050-A

C. Do the procedure to set the clock (Ref. AMM TASK 31-21-00-750-002).

Subtask 31-21-21-710-051-A

D. Do the operational test of the clock (Ref. AMM TASK 31-21-00-710-002)

Subtask 31-21-21-865-053-A

E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J41
121VU	CFDS/CFDIU/BACK/UP	8TW	J40

Subtask 31-21-21-860-050-A

F. The time displayed on the lower ECAM display unit should be in accordance with the clock.

5. Close-up
Subtask 31-21-21-942-050-A

A. Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:33:25 UTC